<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css" integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
    <script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-Fy6S3B9q64WdZWQUiU+q4/2Lc9npb8tCaSX9FK7E8HnRr0Jz8D6OP9dO5Vg3Q9ct" crossorigin="anonymous"></script>
    <title>decoment</title>
</head>

<body>
    <div class="jumbotron jumbotron-fluid">
        <div class="container">
            <h1 class="display-4">我的第一个Bootstrap页面</h1>
            <p class="lead">重置窗口大小，查看响应式效果</p>
        </div>
      </div>
      <div class="container">
        <div class="row">

          <div class="col-xs-12 col-sm-12 col-md-6 col-lg-4">
            <div>第一列</div>
            <div>学的不仅是技术，更是梦想</div>
            <div>再牛逼的梦想，也抵不住你的坚持</div>
          </div>

          <div class="col-xs-12 col-sm-12 col-md-6 col-lg-4   ">
            <div>第二列</div>
            <div>学的不仅是技术，更是梦想</div>
            <div>再牛逼的梦想，也抵不住你的坚持</div>
          </div>

          <div class="col-xs-12 col-sm-12 col-md-6 col-lg-4">
            <div>第三列</div>
            <div>学的不仅是技术，更是梦想</div>
            <div>再牛逼的梦想，也抵不住你的坚持</div>
          </div>
          
        </div>
    </div> 
</body>
</html>